P-process nucleosynthesis inside supernova-driven supercritical accretion disks

We investigate p-process nucleosynthesis in a supercritical accretion disk around a compact object of 1.4 M_⊙. Supercritical accretion is expected to occur in a supernova (SN) with fallback material accreting onto a nascent compact object. We find that appreciable amounts of p-nuclei are synthesized via the p-process in the disk when the accretion rate M > 1.6 × 10⁶ L_Edd/c², where L_Edd is the Eddington luminosity. Abundance profiles of p-nuclei ejected from SSADs have similar features to those of oxygen/neon layers in Type II SNe when composition of the fallback gas is initially those of the oxygen/neon layers in the progenitor. The overall abundance profile is in agreement with that of the solar system. Some p-nuclei, such as Mo, Ru, Sn, and La, are underproduced in SSADs as in Type II SNe. If the fallback gas is mixed with a small fraction of proton, significant amounts of ⁹²Mo and ¹³⁸La are produced inside SSADs. ⁹⁶Ru, ¹¹³Sn, and ¹¹⁴Sn are also abundantly produced when the fallback gas contains abundant proton though the overall abundance profile of p-nuclei is rather different from that of the solar system.